I don't know where you live but here in Central Vermont, we've got mountains and plenty of them.The ST2 is doing great. 60+ miles on UHF. Are you saying the discone should be working better? Its not picking up much past 25 miles on any band. With the two at the same height, I get 2 bars on ATIS from the Airport on the Discone, and 5 bars on the ST2.
My ST2 is mounted 10' above my metal roof top using the RG6 coax that came with it and I too pick up 60+ miles away.
It was a good investment by far.....
Glad to see yours is producing well also!